Because of a lapse in government funding, the information on this
website may not be up to date, transactions submitted via the
website may not be processed, and the agency may not be able to
respond to inquiries until appropriations are enacted. The NIH
Clinical Center (the research hospital of NIH) is open. For more
details about its operating status, please visit
cc.nih.gov. Updates
regarding government operating status and resumption of normal
operations can be found at
opm.gov.
A complex involuntary response to an unexpected strong stimulus. The reaction involves physical movement away from the stimulus, MUSCLE CONTRACTION and limb flexion, BLINKING, and changes in HEART RATE, BLOOD PRESSURE, and RESPIRATION.
2015; STARTLE REFLEX was indexed under STARTLE REACTION 1966-2014; ACOUSTIC STARTLE REFLEX was indexed under STARTLE REACTION 1973-2014; REFLEX, MORO was indexed under REFLEX 1952-2014
History Note
2015(1954); use STARTLE REACTION 1966-2014, use REFLEX 1954-1965
A complex involuntary response to an unexpected strong stimulus. The reaction involves physical movement away from the stimulus, MUSCLE CONTRACTION and limb flexion, BLINKING, and changes in HEART RATE, BLOOD PRESSURE, and RESPIRATION.
A reflex found in normal infants, observed when the infant is startled or feels the sensation of falling and characterized by sudden extension of the arms. It is only seen in children and adults suffering from disorders of the CENTRAL NERVOUS SYSTEM, and is distinct from the startle reflex found in normal children and adults.